What's the most frequent site involved with salivary gland tumors? are they usually malignant?

Parotid gland is most frequently involved.

80% benign

What is a pleomorphic adenoma?

Most common neoplasm of the salivary gland... it's a salivary gland tumor. Mixed tumor or mesenchymal and epithelial components. Usually in parotid gland, lobulated, variably encapsulated, can recur, can become malignant. Can affect facial nerve VII (motor for muscles of facial expression)

Pathology: 60-65% in descending colon and rectum. Annular, encircling "napkin-ring" shape on left side, polypoid in right colon.

TNM staging of colon cancer
What does it stand for?

T = Depth of Tumor invasion

N = Lymph Node involvment

M = presence of metastasis

Oral Manifestations of GI tumors:

Malignant neoplasms or liver and GI tract occasionally metastasize to the oral regoin, most commonly to the posterior mandible. They can present asymptomatic or with jaw or tooth pain, paresthesias or teeth loosening (unexplained).